﻿using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Security.Cryptography;
using System.Collections.Specialized;
using System.IO;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.Net;
//using PlugNT.Cms.Web.Zfb.bz.Gateway;

namespace PlugNT.Cms.Web.Zfb.bz
{
    public partial class Alipay_Return : System.Web.UI.Page
    {
        public static string GetMD5(string s)
        {


            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] t = md5.ComputeHash(Encoding.GetEncoding("gb2312").GetBytes(s));
            StringBuilder sb = new StringBuilder(32);
            for (int i = 0; i < t.Length; i++)
            {
                sb.Append(t[i].ToString("x").PadLeft(2, '0'));
            }
            return sb.ToString();
        }
        public static string[] BubbleSort(string[] r)
        {

            int i, j; //交换标志 
            string temp;

            bool exchange;

            for (i = 0; i < r.Length; i++) //最多做R.Length-1趟排序 
            {
                exchange = false; //本趟排序开始前，交换标志应为假

                for (j = r.Length - 2; j >= i; j--)
                {
                    if (System.String.CompareOrdinal(r[j + 1], r[j]) < 0)　//交换条件
                    {
                        temp = r[j + 1];
                        r[j + 1] = r[j];
                        r[j] = temp;

                        exchange = true; //发生了交换，故将交换标志置为真 
                    }
                }

                if (!exchange) //本趟排序未发生交换，提前终止算法 
                {
                    break;
                }

            }
            return r;
        }

        //获取远程服务器ATN结果
        public String Get_Http(String a_strUrl, int timeout)
        {
            string strResult;
            try
            {

                HttpWebRequest myReq = (HttpWebRequest)HttpWebRequest.Create(a_strUrl);
                myReq.Timeout = timeout;
                HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();
                Stream myStream = HttpWResp.GetResponseStream();
                StreamReader sr = new StreamReader(myStream, Encoding.Default);
                StringBuilder strBuilder = new StringBuilder();
                while (-1 != sr.Peek())
                {
                    strBuilder.Append(sr.ReadLine());
                }

                strResult = strBuilder.ToString();
            }
            catch (Exception exp)
            {

                strResult = "错误：" + exp.Message;
            }

            return strResult;
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            ///当不知道https的时候，请使用http
            //string alipayNotifyURL = "https://www.alipay.com/cooperate/gateway.do?";
            string alipayNotifyURL = "http://notify.alipay.com/trade/notify_query.do?";

            string partner = ""; 		//partner
            string key = ""; //安全校验码 
            //alipayNotifyURL = alipayNotifyURL + "service=notify_verify" + "&partner=" + partner + "&notify_id=" + Request.QueryString["notify_id"];
            alipayNotifyURL = alipayNotifyURL + "&partner=" + partner + "&notify_id=" + Request.QueryString["notify_id"];

            string responseTxt = Get_Http(alipayNotifyURL, 120000);
            //*********************************************************************************************
            int i;
            NameValueCollection coll;
            //Load Form variables into NameValueCollection variable.
            coll = Request.QueryString;

            // Get names of all forms into a string array.
            String[] requestarr = coll.AllKeys;



            //进行排序；
            string[] Sortedstr = BubbleSort(requestarr);

            //构造待md5摘要字符串 ；

            StringBuilder prestr = new StringBuilder();

            for (i = 0; i < Sortedstr.Length; i++)
            {
                if (Sortedstr[i] != "sign" && Sortedstr[i] != "sign_type")
                {
                    if (i == Sortedstr.Length - 1)
                    {
                        prestr.Append(Sortedstr[i] + "=" + Request.QueryString[Sortedstr[i]]);

                    }
                    else
                    {

                        prestr.Append(Sortedstr[i] + "=" + Request.QueryString[Sortedstr[i]] + "&");
                    }
                }
            }

            prestr.Append(key);

            //生成Md5摘要；
            string mysign = GetMD5(prestr.ToString());


            string sign = Request.QueryString["sign"];



            if (mysign == sign && responseTxt == "true")   //验证支付发过来的消息，签名是否正确
            {

                //更新自己数据库的订单语句，请自己填写一下

                //如果您申请了支付宝的购物卷功能，请在返回的信息里面不要做金额的判断，否则会出现校验通不过，出现调单。如果您需要获取买家所使用购物卷的金额,
                //请获取返回信息的这个字段discount的值，取绝对值，就是买家使用购物卷的金额。即 原订单的总金额=买家付款返回的金额total_fee +|discount|.	


                Response.Write("success");     //返回给支付宝消息，成功
                Response.Write("<br>------------------" + Request.QueryString["body"]);
            }
            else
            {
                Response.Write("fail");
                Response.Write("<br>------------------" + Request.QueryString["body"]);

            }

        }
    }
}
